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The Liskov Substitution Principle (LSP) is one of the basic principles of object-oriented design. The Richter substitution principle says that wherever a base class can appear, subclasses can certainly appear. LSP is the cornerstone of inheritance reuse. Only when derivative classes can replace base classes and the functions of software units are not affected can base classes be truly reused, and derivative classes can also add new behaviors to base classes. The Richter substitution principle is a supplement to the "open-close" principle. The key step to realize the "open-close" principle is abstraction. The inheritance relationship between the base class and the subclass is the concrete realization of abstraction, so the Richter substitution principle is the specification of the concrete steps to realize abstraction. --From Baidu2121Telefocal sampleSource source = new Source ();压在他身上闷笑起来，笑得都软了，好一会，才喘气道：谁让你打……打那里的？李敬文本来还想解释的，又觉得这样也挺好玩，于是将错就错。吴姨娘坚定地说道：老爷请恕妾身直言，这怎么是糊涂呢？妾身觉得田翰林这样的人品样貌，大靖能有几个……张杨怒道：你也知道人家是人才？那你还敢有如此念头？当人家是什么人了，我玄武王府能‘召之即来，挥之即去？吴姨娘听了一呆。阴谋不明。2012年浪漫喜剧《年度学生》后续报道。